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President Barack Obama has ended the longstanding policy that grants residency to Cubans who arrive in the US without visas.
The 20-year-old policy allows Cuban migrants who reach US soil to become legal permanent residents after a year.
In exchange, Havana has agreed to start accepting Cubans who are turned away or deported from the US.
The move comes as President Obama tries to continue the thawing of relations with Cuba in his final days of office.
He said: “With this change we will continue to welcome Cubans as we welcome immigrants from other nations, consistent with our laws.”
It is unclear where relations between the two countries will go now.
His successor, President-elect Donald Trump, has taken a much tougher stance and could reverse the change.
Until now, this so-called “wet foot, dry foot” policy has applied solely to Cubans.
Other immigrants who come to the US without a visa could be arrested and deported.
An extraordinary period of change: analysis by Will Grant, BBC News, Havana
There have been two key parts to Washington’s policy towards Cuba for decades – a carrot and a stick. The stick is the US economic embargo on the island – that can’t be removed without the approval of Congress.
But the carrot that has been dangled before Cubans is a special immigration right known as “wet foot, dry foot”. Under that policy, Cubans who manage to get a single dry foot on US soil have the right to residency without a visa and can apply for citizenship.
The Cuban government blames the measure for the brain drain on the island and for encouraging thousands of people to risk their lives each year in attempts to make it to the US on rickety rafts.
In the US itself, it has also provoked anger among other Latin-American lobby groups who feel the policy unfairly favours Cubans and grants them an immigration status well above that of other Latinos.
The latest wave of Cubans trying to reach the US are economic migrants like any other in the region, they argue, and not political refugees.
With the recent thaw in relations between Washington and Havana, it always seemed likely that the policy had its days numbered – why provide an extra incentive to Cuba’s people to escape if the communist island it it’s no longer your enemy?
The Obama administration decision to remove the long-standing measure is probably its last act in an extraordinary period of change under the outgoing president.
Felice Gorordo, Cuban American from Miami and former Obama White House staff, told the BBC this was an important step in the normalisation process and a bold move from the president.
“Cuba will forever be an integral part of President Obama’s legacy and I think he wanted to leave office knowing he made as much progress as he could to help define a new chapter with the Cuban people.”
But the pace of reform has angered many Cubans in the US who say it rewards a regime which has failed to address concerns over its human rights record.
Miami Mayor Tomas Regalado, a Cuban exile, blasted Obama for giving Castro a parting gift.
“This is just a going-away present from Obama to Raul Castro,” he said.
Mr Regalado does not believe ending the policy will slow the flow of Cubans coming to the US. All it does, he says, is throw the process into question.
“The question now is what will happen when the Cubans arrive in the [Florida] Keys and cross the border?”